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决定淬火工件表面冷却快慢的两个新因素
(北京华立精细化工公司,北京 102200,中国)
Two New Factors Determining the Cooling Rate of Work Piece Surface during Quenching
Beijing Huali Fine Chemical Co. Ltd., Beijing 102200, China
发表于《热处理》2014年第6期
摘要:用标准探棒检测出的油或者水的冷却速度曲线既不能反映探棒表面的冷却情况,也不能用来推测工件表面的冷却过程。要了解工件表面的冷却情况,须对工件的冷却过程做直接观测。汇总多项直接观测和研究结果后发现,除了淬火介质的冷却能力和所在局部的有效厚度这两项因素之外,在不同表面的蒸汽膜内气体的流动情况和表面从蒸汽膜向沸腾冷却方式转型的先后次序,对试样表面冷却的快慢和整个工件冷却的均匀性都会产生巨大影响。揭示了后两类因素影响工件冷却快慢和冷却均匀性的基本规律。利用这两类新因素的作用规律,可以在淬火冷却过程中对同一工件上不同表面部分的冷却快慢分别加以控制。把这类控制技术称为精细淬火冷却技术。
Abstract: The temperature cooling rate curves of oil and water detected by a standard probe can neither reflect the cooling status of the probe surface nor can they be used to make deductions about the cooling process of the work piece surface. In order to gain information about the cooling status of a work piece surface, the cooling process of the sample should be observed directly. By studying and summarizing several observation results, it is found that apart from two factors (the cooling capability of the quenching medium and the effective thickness of a certain surface point), the gas flow within the vapor blankets of different surfaces and the sequence of transfer from vapor blanket stage to boiling stage could both greatly influence the cooling rate of a given surface point and then the cooling uniformity of the whole work piece. The effect mechanisms of the two new factors on the cooling rate and uniformity of the work piece is investigated in this paper. According to the effect law of the new factors, the cooling rates of different parts of the work piece surface can be controlled separately in the quenching process. This kind of control technique is called fine quenching technology.

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